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Finding the Fourth Proportional to 115.40, 159.28 and 71.77

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Solution

The fourth proportional to 115.40, 159.28 and 71.77 is: 99.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.40 : 159.28 = 71.77 : x
  2. Step 2: Convert to fraction form
    115.40/159.28 = 71.77/x
  3. Step 3: Cross multiply
    115.40x = 159.28 × 71.77
  4. Step 4: Simplify right side
    115.40x = 11,431.53
  5. Step 5: Solve for x
    x = 11,431.53/115.40
  6. Step 6: Final answer
    x = 99.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.